Cheap cheap CHEAP gas in South Carolina. If you can wait to cross the border, you can expect to save at least 15 cents a gallon. Though it’s not really worth going much out of your way. Even if you’re putting 20 gallons into your SUV, you’ll only cut $ 3 off your bill. If it takes you any more than ten minutes, you should think about how much your time is worth. This Kangaroo is like others, with a really wide pump area. You can pay and go at the pumps, or pop inside and pick up a Coke from their wide variety of snacks and drinks.